I think another big part of it is down to the lack of regulation. Other countries with similar socioeconomic conditions tend to regulate things quicker plus ha

I think another big part of it is down to the lack of regulation. Other countries with similar socioeconomic conditions tend to regulate things quicker plus have social programmes (healthcare, workers rights etc) The US does neither. I think this makes it easier to start in the first place. The other part, as others have pointed out, is the extreme development the US achieved on the back of WWII that provided capital which has snowballed since.